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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb72850a8b3e30c3ddc638beaa09ec1e52471f8c64f5b35a3ea0f468bfdaffa' 
  AND token = '+GKYWCJXbO2tK4Ed06UnkQDf+t0IQpMy99idCqbGs/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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