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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c4d483d1015b7d8133919b5a1f9dc3fa62be8b986bfdf368989fc366c2819ee' 
  AND token = '4tt5i+QZaDJ7bZOqPVo0ihmnOou0xg8Eve8VTOuFAzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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