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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1167e1c8a04969f6be803f060ac167ddb28d3105b4534c8dbf2a3689a07d940' 
  AND token = 'IF0yX35LDIa06MoGHibTZKhmTlYTsUY2d/49aqyknRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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