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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb91de7405f9cf7afc8f8c58083a0a2105d83ae7739c2ee6aa4f9c8fd6abef6' 
  AND token = 'S5eU3OOMbWFtSJEbIXd3BuK2/lqGODpgpJCFoiYsRpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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