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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3bd17d65e6d0f5366056b670df144ff14691e9f85c02da12ab3caaaecd340bb' 
  AND token = 'WBEgtSLC7k8asY7yV6p8fGx9uHhQhyqcIQwjsi9FAfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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