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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea482dcff2a3cbb12b9c64e8aeb5fcc74222804d42b275356e1fecc11720f10' 
  AND token = 'NrB97G6nsOj3t0MteZTrDx01dydGj/mG47oLYrNeoMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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