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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e884c60e0674f9e8dc19772b5dc30932f72a5e1f9983994a3644ef05c8f0af0f' 
  AND token = 'O70xCLtiGEplNLxS24lzZWuEbUD1tqIT9q6xsjDhmaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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