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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1336172bd6f856a2c92a8dd11ed2e12c31a1da0feb91746a67202cd8695f53d8' 
  AND token = 'oz17IIEUneoZx8LyIf/3T0Rhgcupo/pH95OPZKfaUEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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