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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ece5a53f4dd5f99f0991960efede21f163db8493cd26f8d484622908faba2f' 
  AND token = 'ou07z5JouMdATRlsr7g7OfqbBzSXduTT5JfssUC+Ke4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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