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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1931902662db7911234779c64981ee0061af749731810e156af62880b693dc6b' 
  AND token = 'Ap28ei0qkw8dVYjzmCZYBI80fK6rtBL3+ASrgDB8sv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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