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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d772751bb2e2c60dd7a02f50814495927fa2084ce8aa075a2220ad2ab127cdf' 
  AND token = '7G0AFIDYuoYj8xHKm7Q89LVMtSDxhZb3TvT/03HhXMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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