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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b2e29316669f211d349ecd29d87e40ebec33952e5ffaa778df480df14c998f' 
  AND token = 'hAcwCZXn3nbaS/jDaqRER2inBSUf+ED3jLInBdJ1fpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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