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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2669df9948ec5c92cb8234dead6b5511236bbab99c17cde2106762fdf7264a8' 
  AND token = '9nv9EJCFm28Z7UnmhdBIl4PnqXoU3ST8DSdEaPsSqDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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