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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913ef1a6c5e3d05b885af799de3cbdeb735c5583d08d30c86ead47a8abfec0c2' 
  AND token = 'K82IHfsr0VUVu/LBEjoa3q5UPZYY3O8kv5gnfwkcDSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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