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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c3a5c07c23482a5e64a2a4800d6640a15a9bd02dc58c450cbdeb3cdf17d152' 
  AND token = '4tAdbMZYX0bCpb49Kq392Az2L6bWaSJEiR8T6s+GwSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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