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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e318c95435bfad79d02322785b4439478b99eeab1855e0b37520823a8a2c5902' 
  AND token = '9dt6YzUwKIhv4dNLHvKZ2i/WDv/8wyq7JYktdmmN6ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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