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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69843ff1679d3138d4f43118af0eacf349ade914d6b2c4f6fea0d196fdca499c' 
  AND token = 'irBsVufOntGS5iiRz+vtUu4rT7U89j+z7/UhOz5cC5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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