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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a038ff5a6246356b63d3ba29044451c80eb2e29ea9a011cc34046cad6ab2ca12' 
  AND token = '9CniPpS547D8tpywJWcOL2hGAZK3UXb6i7wy4TFAmRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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