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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aea33067e45182b6f71db2134f6af9ab8ae797038575f902ad4e234eedfb0ab' 
  AND token = 'loFl5sTRMD8yHGf6TwgL44zcz1xTLDdxCfQ1F/W4d3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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