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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '420985e3b16d6ec4b9220c25e595c27b5c3fff449efa5360167f79fdd3330882' 
  AND token = 'xLa5WKYr9/tVafacRtQOo5nhyRgfNxFn50vI3TC9Snk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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