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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8885a71b049a32df70521118d4c4087be4975896bccefa7c82ce8be66e5dc966' 
  AND token = 'x3MD4OCiwDpouPYLaDUV2pJIOg69LLhuAhP2oerCCLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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