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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bace991d0c31fcea137b2a5d4eff10f94548ac831717f9780c647a503531cb05' 
  AND token = 'E6RcEbKq6yMHv/8Ckrx6cerqvYfws1SBIqNsNKs5VVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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