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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eaee15bcb115e093ed342e1f2f6d8a632b0416adaa131d97f12e463c82feed2' 
  AND token = '03J+AqvtVNQRq4bDyBP8WEs8dNKHyWuA5866Gl7qLSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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