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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d68070c0a6e76aca0d52cf7be65e4694bac0af3d4beabd6a93fa86f0e85529' 
  AND token = 'm//rQQg9P9f+t/S7g8ywFzmF+bP2G0OevplDoWX2eoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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