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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc09c3101079f771226a2f7da9555d501ff4c2ba748f8221bf698f43a52eea38' 
  AND token = '5WfnlFh6e1TcgzZxMhJJIibEomy9C5LBawaOoqTa6EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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