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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5d42f5e93ade424617055ad64ba0afa9ed5a803be007c54bd00c7589f436e6' 
  AND token = '7gEi/IE6p0xCbAE47AP6YfwV3FZhUdwocxHB+EOx31o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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