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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dead9224b97dba62cd6b8046809a5e2042ad2d00855bd346b8c6d9ba79e21875' 
  AND token = '1kOTvdmGj8gjpM5xwPXgE3+/bZenil4SZnFFL+zkWSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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