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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b08d954e00997535ecf034cc4b48f7cae1d01a27f6faef08c42b003f1a3200b' 
  AND token = 'wjG5t1tPL5vTV0M+22zWWfch6StjSDKZc2vbDBvdTr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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