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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f87e2f467ef5b89fd7765cf88a283a4fe7aee7f90b04f0521497eccc7e986d' 
  AND token = 'xF3TV3HkJb4cgqL0EeVvsbuaQtVmLwTXRwoWdwQdkIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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