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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8decad85e0ff9b9e097d4d6b323d4af8311ddd3c5258e4cfaf16332f1e6e20ca' 
  AND token = '5388CkJOjyUVB4QZhOOsIVAByRxx4shRnEir0Ge32OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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