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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c9116525532e08df77c06550f4b0e91a3da4f5c9d8898437fc2bdfeb8b30d7d' 
  AND token = '1saJZnxgcRT8FPK/XXCDcXmwnRE8Z49O7qtE5DmMqBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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