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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb31d01b4682766918cb03046d34df87fb433dd5d61699c3737fce965adb203' 
  AND token = 'w4vQEiehb9VP4raM/3vs5d4sWVF2cp/XcfN9EWeiY9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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