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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27ef5cf2f6e23cff206337c128d9ad0ecdf389b28454ea7d23ef9128e9f48837' 
  AND token = 'W89YhSTI73RHMNRmbqoSlpIU51mguERmHGQEFdwK1lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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