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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '674b9965eff1ae5c4737bf9ef10c292fd6779475dcfc5f95f41fade8351b3c3d' 
  AND token = 'VTR21dssqZvMwxSsOX8poJ0a3+bgSjVmlqajfit8p+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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