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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8309c3cd75ae9fdd1f5a4a8c097fe9eb90578bbf62c4bf297cba955191ac07aa' 
  AND token = 'P+joyIcZb6eGfN84WMGpRF8+kcPZZlexNR6SvI7t1/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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