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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a56d8ae2895a61d487550aa58bed1dd8a4875f75f79b1b7f925c1248de8822' 
  AND token = 'c6cgcEg0gcJCJuYj8rtyffTZyUlBP7rso7bwTRVQvTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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