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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc0b4c9a29c9c553c9d2ced0b5033fc2c6b9bf277ae3d247c3ada20036f9cae' 
  AND token = 'qpQRypAu89jB2J+P1u7mt/lhivR4+Hdgmzy5UFEZf2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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