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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aba4431fb3c45b4b081b2548383be8a86ef4f72bd711b1a079781834600aae9' 
  AND token = '6HClZ6kX1TxoYb2obahQKnKJQ8SGbbqtXw9x1oTA7UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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