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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036b1d7b431a3057d3db0cf0080f8c43f28b807cbd7ff863d640ad8df72822f0' 
  AND token = 'TGI8k6SLVoAPT46RROHEHi9NBcBS8lrSOERlANtZ2PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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