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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '127d044a14578f93a3431fa4383fe797b11ade848a5105a122954785ccf31b08' 
  AND token = '2GUWDYm2N2oQhGizc8olo0ZX4kHNV5/gi/v42/o8lu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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