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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe29ccf99e99bf4931e4b6330e015109ba45617066bda65d3a7b747e9f0dcc4' 
  AND token = 'trMNofWdaIv780GDR+5RBNlklH70Kp0Wfhu3iyWLZkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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