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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ffd5f90c2b87c0029904aa54430ab702bf82f9ed370034e2eef97d6dff2c415' 
  AND token = 'R467Rzf0xWFtwYSSUCM5X7VL75Ds9QMYG8bJi9PH5hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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