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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cea13f4f047a79d0387503fa3e53b67825ba4d7c16ccd7bbd932c932b7b189a' 
  AND token = '/0fN+jJ2T0e4soxz1q38u+gJ0D7Fx79BahWOcyBI3tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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