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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a972be30a2212f411721ae11b17f4aaf80a16490c3a154aa8c8980dc5bd6137' 
  AND token = 'fZQJtYfOr/sBZ8xghYU2x0lnKER8Ied1f4udFkH6CqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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