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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12bc64d8a35603cfef9b221af6b59e0f01bfbf745ef3d174b10b7c6f293f4ba3' 
  AND token = 'k7APNc5huzasfQXn3szTM7B/6DBvx1ZdNfNoO5s82hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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