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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ece6600990263b7ccbd36bc0b59df5e646df9552cbd367bb6706f07eb14257' 
  AND token = 'h2umg+ucgl2ymkYqvlRlpYaQhsP7gRiDAl1okiVm59c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00134

JSON explain

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