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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3044c5a329a0cd2a4c235af1eba3e649f163eed2217386ae54d086c9123d7269' 
  AND token = 'C6DynOkO68PTrvdRbz8VGrn3aiKAGGBZNqHvAs9OQR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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