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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9a79ce2ca42117f4b82a5fb8d7b0d9a21fa1657247bcf4bef122637bee2da0' 
  AND token = 'Eshjk5HayrWpHG7aqgJKvHkDa9ALZBuKqWcORcV7efs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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