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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '643e2379cc6498d9ec7e641baaf6fb350957bbc0abc6a24332fd2ed1e36360eb' 
  AND token = 'dLNyWao58EyULyXu+CnR1EnC3WQ0Gv1P0og5CWiMpVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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