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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95aba9cee0bf538dc36991b1382d259457123694089e6b593144d5b5fde46d1c' 
  AND token = 'Oy3R0H8y/bkNEowJEMNK8SyMLCxUrL9xOAhb8eyOaZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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