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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98517f457db0274ae105892c4038cd4ce5956a7f43267ddedf2c613895959137' 
  AND token = 'P0rpX3liM2E6ZpDn/fd0tAS+4qaSJ1wolQXWCFpiTDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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