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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16a728cdcd8d2a04d65712bde15c9460aeab1e60b1018d3a9f1d561ec9cbc537' 
  AND token = 'ZK4Lae42gcGf+6d9j037xZGpbqcTkkvBviWLm7QxPIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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