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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f9eeb8a8da990599b4d5c65c93634d4d7f96405e0da3a9f5e74c65594e7516' 
  AND token = '2Xw22X5576BYWiWScnwGh6/3Nd01Hc2QbouWb0W00yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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