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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584ee00f4eaf3a5c149eb21c2e560f23bd71f5e71277009886afb874ceebbf28' 
  AND token = '4iYzk5eZYTLM6p8TqM2pXF+SkNYpYIXhgx/1kB2FYAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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