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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57775d1f09543f2e214b60d1140e10f58063bda003468c772ac057bbeb835f3d' 
  AND token = 'B+tRs///znTrxXpXZbfYuW5hzR7P70ErWKx3vGY8eHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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