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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39da89e98792c61df6f38cab94596022b40565a72bce1b9284aa4d44982ee50a' 
  AND token = 'W0gm9CsJYz5jGxb6sg8Lbv16SWQ2q8k3v+6Uw1eF4a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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