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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dddfc410898a2bed8725c5af36dab28b384ad17b82acbe3f3a18d46bac297a8' 
  AND token = 'w2qjDrO5GEgY8gtGGmBQ2YgrKYYj+TKC56kYHGF6/6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}