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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '775714aee296862b6e9c67ce45a6bc6ca8ec52bab9774da98308b06ce4b9653d' 
  AND token = 'PLOugpM+8f20tQ7/tDIhnnSeRENTE8lxOP1YBeMjODw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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