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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5a4a6844088e006a6050f184ea79b35fc4c4d166c86666cdc603dfbdcfd737' 
  AND token = 'hIMkYPnlmHucHW3/cJXfRjxZF9YN6RfdtBavJvZmzUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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