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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12d153b5898ba2ad2849df9385e35b632b0b70142138d34ef9587c2b042afdfa' 
  AND token = '0ZaYImR6us526aRlEbWmdeDKywa7K0wGUpIJ/Z4Gk6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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