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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6966353439435b7a470f5067e60be96ecd52d7806e3cdd51d2b03071815dee1' 
  AND token = '3K/2ztePs1/3nKyo/i4Ek4w9OaIBZyVWjeB5fSiVPSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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