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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a38835c3a563a8286abe835cff19048f9daf70692310c65c56df5f60b05ef0' 
  AND token = 'GCmWWnQFTrEVwam4nDAZmIIqF2IpS06UA5wpENf3O/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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