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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abc7495a0ea5546c43fb15615dcda846dcd23bb5d08b2f349033352103b8e404' 
  AND token = '9k+i/e8mH2cimT7YuX8VaeWb8E0qTgsTAsK3WbCwx30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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