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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f0e46dec7db6482a1436606ee5e7c657a3c7b6bf13ba1833d07a8f88dcdb3d6' 
  AND token = 'NyRkOqWeZ7EukXif6G86xoyXnYuoKwjaMgIdJQpb88w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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