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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26eb6d34baa7ce190456453cbfd3f5bd893e12c545ee52f79db8f1933101849b' 
  AND token = '9eersd+rzpYCpDxRVWQS8SRatNAdXJRzsf+0LGZiMJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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