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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fffa9b2ed9591ee525ac46b810d2e6d565b32f7014d35ac4b3926feb6fad52aa' 
  AND token = '7hp69TgNz0srSHqk3pUSvSAHA1cbuwqoVKDkiEACTGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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