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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70cf480c67697eb9fdf512ddc3dc29ae8c0b31fcc74535ad456ce2cfbcfcc392' 
  AND token = 'aidPwyrX+eJAOaFWYjHwAghVXcrG1koYLhLkqA7bIUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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