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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9a91d4bf9659b5cd59780697e8a63180e2cc471a25aa7b7bb9665be1aa74ba' 
  AND token = '/+S8uNpiGe6/dJBC/ucEUQhMbZlGlpfhq0tCLO+vhdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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