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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ccce008fb4c8245caa85f7c11f8e6eb4da3b8d0fc9812ec21a1c443d8885ec5' 
  AND token = 'D0a0k0xyCZWS/Q6VI8GoHgpAJMPpeO25WZJ6ADRKtq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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