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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd058e49ee788531b9c00f7a7ae08bdf3a9033a2a2431b7cb369742d54f7339' 
  AND token = 'lxPcziM2mufggiaAuYcPzv3qpHJILAWbjapU47HFhUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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