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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7694b2beb7cdbdea29fcabd009ed5392259cf15b79e7d786a423fbdb38a6ae47' 
  AND token = 'nFMr6TJE4Y4hbx4fya5n3VVELRJo1s22EIciMImFOJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00245

JSON explain

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