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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f44d5a28e1f2aeab665f9d4acacc20e35610017fc367df2368927651b6ff31' 
  AND token = 'vtjqeBh6lboZ72sP+1f5Vvtab2qE8zWJ4+NYiKi7kbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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