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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823697d2999df62db90605356fc9e9dbeeb1b895b2a7b9b53082aca0e4d9ed23' 
  AND token = 'E6ED+5WoEjzNEsr924jGHYy7uQztbNKCFz/JfJv9DLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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