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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de806479d3fa86cdf993b1ebe325d7ccfa91fa51d5909ce6e29a52efdcda1ef2' 
  AND token = '+Ci94ikz338zGz/VQPnz2N190vdEthJCQQau9hlLj/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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