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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6eef000b53b8cc3e9154f1b6785e140d671bc03a603e3f31d4d5524af4e20e' 
  AND token = '4qtOyAQ4oE70/UThxuKV9dwIyLeqkWhSOxU2oqEi68A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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