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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc5f861a25f86f077f1c1e87cb94221a1f26079f1017b9c0cdd826f5935c7ba' 
  AND token = 'OwVG4qjD40qB4Zl04Mr4JKZAb95aZTYVluku821wq0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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