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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acaf82b41ad6769a2dcdb2599eb2e662edbbf5c7a60c116ea0365217543ec3fa' 
  AND token = '+xMqZ0nQutoRNuCTZLr1M3g+NK+28XMcvOYIlNZadlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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