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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6912a18a53a1ea9286875203c7752bf61e6f347fce6000fb9aa83cfe8dacfe2' 
  AND token = '8esLZa0Zu7z0xQO2Y+B3ukRQuvExiedVSVQ7M/8GLnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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